Carriage lifting apparatus

Abstract

A vibration-damping device is interposed between a carriage and a lifting rope. The vibration-damping device comprises a spring extended in a compressed state between a spring shoe on the lifting rope side and a spring shoe on the carriage side located above the first-mentioned spring shoe, and a damper extended between the spring shoe on the lifting rope side and the spring shoe on the carriage side, and upper and lower ends of the damper are pivotally mounted on the spring shoe on the lifting rope side and the spring shoe on the carriage side.

What is claimed is: 
     
       1. A carriage lifting apparatus, comprising: a carriage having an inertia when lifted;   a lifting rope; and   means for dampening vibrations interposed between said carriage and said lifting rope, said means for dampening comprising a first spring shoe having a spring constant mounted on a lifting rope side of said carriage lifting apparatus;   a second spring shoe having a spring constant mounted on a carriage side of said carriage lifting apparatus, said second spring shoe disposed above said first spring shoe;   a spring having a compressed condition and a non-compressed condition such that said spring in said compressed condition is interposed between said first and second spring shoes; and   a damper, having a dampening force and upper and lower ends, mounted between said first and second spring shoes.   
     
     
       2. The carriage lifting apparatus as recited in claim 1, wherein each of said upper and lower ends of said damper is pivotally connected to said second and first spring shoe, respectively. 
     
     
       3. The carriage lifting apparatus as recited in claim 2, wherein said spring constant of each of said first and second spring shoes , and said dampening force of said damper are adjusted in consideration of said inertia of said carriage.